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Page Title: TROUBLESHOOTING CHART NO. 1 (cont'd)
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Trouble Symptom: Alarm Sounds with POWER Switch On and POWER Lamp Does Not Light.
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TM-11-7440-232-12 Modem Digital Data Manual
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TROUBLESHOOTING CHART NO. 1 (cont'd)

TM 11-7440-232-12/ NAVELEX 0967-LP-275-5010
TROUBLESHOOTING CHART NO. 1 (cont'd)
STEP
INSTRUCTION
INDICATION
YES
NO
REMARKS
2
POWER lamp lights
X
Continue
(cont' )
d
Troubleshooting
NOTE
If POWER lamp remains out, check
continuity of fuse with multimeter.
If good, return to spares.
For Models MD-701/UY and MD-701A/UY
NOTE
Plugs P2 and P3 may be temporarily
disconnected, if necessary, to
disconnect plug P1.
3
Disconnect plug P1 and
check for 115 V ac between
pins A and B using the test
hookup shown below.
P1-AC POWER CONNECTOR
DISCONNECTED AND MOVED
ASIDE FOR TEST
MD-701/UY AND MD701A/UY
5-19

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